已知z=arc sin(x-y),x=3t,y=4t^3,求dz/dx
若z=e^(x^2+y^3),求dz/dx,dz/dy
z=(2y+7)^2 * ln(x^3+2) 求dz/dx 和 dz/dy
f(x,y,z)=0,z=g(x,y),求dy/dx,dz/dx
设有方程x+y^2+z^2=2z,求dz/dx dz/dy
求函数:z^x=y^z的,dz/dx,dz/dy,
已知dz=u(x,y)dx+v(x,y)dy 求 z=f(x,y)?
.高数题 已知函数z=(1/3)ln(x-y),x=sect,y=3 sint 求(dz/dt) | t=π
设x+y^2+z=ln(x+y^2+z)^1/2,求dz/dx
微分方程(首次积分)已知dx/(e^x+z)=dy/(e^y+z)=dz/(z^2-e^(x+y)),求x,y,z的关系
设Z=f(x^2 +y,2xy),求dz/dx和dz/dy
求多元函数的微积分,z=x^y,而x=e^t,y=t,求dz/dt
已知 x = e^t * cos t y = e^t *sin t 求当t= π/3时dy/dx的值